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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number : 1-33891 ORION GROUP HOLDINGS , INC . ( Exact name of registrant as specified in its charter ) Delaware State of Incorporation 12000 Aerospace Avenue , Suite 300 Houston , Texas 77034 Address of Principal Executive Office Title of Each Class Common stock , $ 0.01 par value per share 26-0097459 IRS Employer Identification Number ( 713 ) 852-6500 Registrant's telephone number ( including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) Name of Each Exchange on Which Registered The New York Stock Exchange ORN Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the Registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act : □ Yes No Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act : Yes No Indicate by check mark whether the Registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the Registrant was required to file such reports ) and ( 2 ) has been subject to such filing requirements for the past 90 days : Yes No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files : Yes ✔ No Indicate by check mark whether the Registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company or an emerging growth company . See the definition of " large accelerated filer " , " accelerated filer " , " small reporting " company and " emerging growth " company in Rule 12b - 2 of the Exchange Act ( Check One ) : Large Accelerated Filer Accelerated Filer ✔ Non - accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , initiate by check mark if the registrant has elected not to use the extended transition period for complying with any , new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the Registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act by the registered public accounting firm that prepared or issued its audit report . Yes No Indicate by check mark whether the Registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) Yes No There were 30,460,573 shares of common stock outstanding as of February 19 , 2021. The aggregate market value of the Registrant's common equity held by non - affiliates was approximately $ 95.3 million as of June 30 , 2020 , the last business day of the Registrant's most recently completed second fiscal quarter , based upon the last reported sales price on the New York Stock Exchange on that date . DOCUMENTS INCORPORATED BY REFERENCE Part III - Portions of the Registrant's definitive Proxy Statement to be issued in connection with the 2021 Annual Meeting of Stockholders to be filed on or about April 1 , 2021 , are incorporated by reference in Part III of this Annual Report on Form 10 - K .